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          <h1 class="post-title" itemprop="name headline">网络编程之socket实战</h1>
        

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        <p>网络编程之socket实战，实现了多进程并发处理socket以及点对点的聊天程序。</p>
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<h1 id="多进程并发处理socket连接"><a href="#多进程并发处理socket连接" class="headerlink" title="多进程并发处理socket连接"></a>多进程并发处理socket连接</h1><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;string.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;sys/socket.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;netinet/in.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;unistd.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;arpa/inet.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ERR_EXIT(m)         \</span></span><br><span class="line">    <span class="keyword">do</span>                      \</span><br><span class="line">    &#123;                       \</span><br><span class="line">        perror(m);          \</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE); \</span><br><span class="line">    &#125; <span class="keyword">while</span> (<span class="number">0</span>)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">do_service</span><span class="params">(<span class="keyword">int</span> conn)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">char</span> recvbuf[<span class="number">1024</span>];</span><br><span class="line"></span><br><span class="line">    <span class="keyword">while</span> (<span class="number">1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">memset</span>(recvbuf, <span class="number">0</span>, <span class="keyword">sizeof</span>(recvbuf));</span><br><span class="line">        <span class="keyword">int</span> ret = read(conn, recvbuf, <span class="keyword">sizeof</span>(recvbuf));</span><br><span class="line">        <span class="keyword">if</span> (ret == <span class="number">0</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="built_in">printf</span>(<span class="string">"client close\n"</span>);</span><br><span class="line">            <span class="keyword">break</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">else</span> <span class="keyword">if</span> (ret == <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            ERR_EXIT(<span class="string">"read"</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">fputs</span>(recvbuf, <span class="built_in">stdout</span>);</span><br><span class="line">        write(conn, recvbuf, <span class="keyword">sizeof</span>(recvbuf));</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> listenfd;</span><br><span class="line">    <span class="keyword">if</span> ((listenfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"socket"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">sockaddr_in</span> <span class="title">serveraddr</span>;</span></span><br><span class="line">    <span class="built_in">memset</span>(&amp;serveraddr, <span class="number">0</span>, <span class="keyword">sizeof</span>(serveraddr));</span><br><span class="line">    serveraddr.sin_family = AF_INET;</span><br><span class="line">    serveraddr.sin_port = htons(<span class="number">5188</span>);</span><br><span class="line">    serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">int</span> on = <span class="number">1</span>;</span><br><span class="line">    <span class="keyword">if</span> (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &amp;on, <span class="keyword">sizeof</span>(on)) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"setsockopt"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (bind(listenfd, (struct sockaddr *)&amp;serveraddr, <span class="keyword">sizeof</span>(serveraddr)) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"bind"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (listen(listenfd, SOMAXCONN) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"listen"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">sockaddr_in</span> <span class="title">peeraddr</span>;</span></span><br><span class="line">    <span class="keyword">socklen_t</span> peerlen = <span class="keyword">sizeof</span>(peeraddr);</span><br><span class="line">    <span class="keyword">int</span> conn;</span><br><span class="line">    <span class="keyword">pid_t</span> pid;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">while</span> (<span class="number">1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> ((conn = accept(listenfd, (struct sockaddr *)&amp;peeraddr, &amp;peerlen)) &lt; <span class="number">0</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            ERR_EXIT(<span class="string">"accept"</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">"ip=%s, port=%d\n"</span>, inet_ntoa(peeraddr.sin_addr), ntohs(peeraddr.sin_port));</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> ((pid = fork()) &lt; <span class="number">0</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            ERR_EXIT(<span class="string">"fork"</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">else</span> <span class="keyword">if</span> (pid == <span class="number">0</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            close(listenfd);</span><br><span class="line">            do_service(conn);</span><br><span class="line">            close(conn);</span><br><span class="line">            <span class="built_in">exit</span>(EXIT_SUCCESS);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">else</span></span><br><span class="line">        &#123;</span><br><span class="line">            close(conn);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    close(listenfd);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<hr>
<h1 id="点对点聊天程序"><a href="#点对点聊天程序" class="headerlink" title="点对点聊天程序"></a>点对点聊天程序</h1><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*p2psvr.c*/</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;string.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;sys/socket.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;netinet/in.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;unistd.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;arpa/inet.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;signal.h&gt;</span></span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">void</span></span><br><span class="line">    handler(<span class="keyword">int</span> arg)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">"recv singal %d\n"</span>, arg);</span><br><span class="line">    <span class="built_in">exit</span>(EXIT_SUCCESS);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ERR_EXIT(m)         \</span></span><br><span class="line">    <span class="keyword">do</span>                      \</span><br><span class="line">    &#123;                       \</span><br><span class="line">        perror(m);          \</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE); \</span><br><span class="line">    &#125; <span class="keyword">while</span> (<span class="number">0</span>)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> listenfd;</span><br><span class="line">    <span class="keyword">if</span> ((listenfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"socket"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">sockaddr_in</span> <span class="title">serveraddr</span>;</span></span><br><span class="line">    <span class="built_in">memset</span>(&amp;serveraddr, <span class="number">0</span>, <span class="keyword">sizeof</span>(serveraddr));</span><br><span class="line">    serveraddr.sin_family = AF_INET;</span><br><span class="line">    serveraddr.sin_port = htons(<span class="number">5188</span>);</span><br><span class="line">    serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);</span><br><span class="line">    <span class="comment">// serveraddr.sin_addr.s_addr = inet_addr("127.0.0.1");</span></span><br><span class="line">    <span class="comment">// inet_aton("127.0.0.1", &amp;serveraddr.sin_addr.s_addr);</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">int</span> on = <span class="number">1</span>;</span><br><span class="line">    <span class="keyword">if</span> (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &amp;on, <span class="keyword">sizeof</span>(on)) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"setsockopt"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (bind(listenfd, (struct sockaddr *)&amp;serveraddr, <span class="keyword">sizeof</span>(serveraddr)) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"bind"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (listen(listenfd, SOMAXCONN) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"listen"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">sockaddr_in</span> <span class="title">peeraddr</span>;</span></span><br><span class="line">    <span class="keyword">socklen_t</span> peerlen = <span class="keyword">sizeof</span>(peeraddr);</span><br><span class="line">    <span class="keyword">int</span> conn;</span><br><span class="line">    <span class="keyword">if</span> ((conn = accept(listenfd, (struct sockaddr *)&amp;peeraddr, &amp;peerlen)) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"accept"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">"ip=%s, port=%d\n"</span>, inet_ntoa(peeraddr.sin_addr), ntohs(peeraddr.sin_port));</span><br><span class="line"></span><br><span class="line">    <span class="keyword">pid_t</span> pid;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> ((pid = fork()) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"fork"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">else</span> <span class="keyword">if</span> (pid == <span class="number">0</span>)</span><br><span class="line">    &#123; <span class="comment">// 子进程</span></span><br><span class="line">        signal(SIGUSR1, handler);</span><br><span class="line">        <span class="keyword">char</span> sendbuf[<span class="number">1024</span>] = &#123;<span class="number">0</span>&#125;;</span><br><span class="line">        <span class="keyword">while</span> (fgets(sendbuf, <span class="keyword">sizeof</span>(sendbuf), <span class="built_in">stdin</span>) != <span class="number">0</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">if</span> (write(conn, sendbuf, <span class="keyword">sizeof</span>(sendbuf)) &lt; <span class="number">0</span>)</span><br><span class="line">            &#123;</span><br><span class="line">                ERR_EXIT(<span class="string">"write"</span>);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="built_in">memset</span>(sendbuf, <span class="number">0</span>, <span class="keyword">sizeof</span>(sendbuf));</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">"child close\n"</span>);</span><br><span class="line">        close(conn);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">else</span></span><br><span class="line">    &#123; <span class="comment">// 父进程</span></span><br><span class="line">        <span class="keyword">char</span> recvbuf[<span class="number">1024</span>] = &#123;<span class="number">0</span>&#125;;</span><br><span class="line">        <span class="keyword">while</span> (<span class="number">1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">int</span> ret;</span><br><span class="line">            <span class="keyword">if</span> ((ret = read(conn, recvbuf, <span class="keyword">sizeof</span>(recvbuf))) &lt; <span class="number">0</span>)</span><br><span class="line">            &#123;</span><br><span class="line">                ERR_EXIT(<span class="string">"read"</span>);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">else</span> <span class="keyword">if</span> (ret == <span class="number">0</span>)</span><br><span class="line">            &#123;</span><br><span class="line">                <span class="built_in">printf</span>(<span class="string">"client close\n"</span>);</span><br><span class="line">                <span class="keyword">break</span>;</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="built_in">fputs</span>(recvbuf, <span class="built_in">stdout</span>);</span><br><span class="line">            <span class="built_in">memset</span>(recvbuf, <span class="number">0</span>, <span class="keyword">sizeof</span>(recvbuf));</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">"parent close\n"</span>);</span><br><span class="line">        kill(pid, SIGUSR1);</span><br><span class="line">        sleep(<span class="number">1</span>);</span><br><span class="line">        close(conn);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    close(listenfd);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*p2pcli.c*/</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;string.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;sys/socket.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;netinet/in.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;unistd.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;signal.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ERR_EXIT(m)         \</span></span><br><span class="line">    <span class="keyword">do</span>                      \</span><br><span class="line">    &#123;                       \</span><br><span class="line">        perror(m);          \</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE); \</span><br><span class="line">    &#125; <span class="keyword">while</span> (<span class="number">0</span>)</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">handler</span><span class="params">(<span class="keyword">int</span> arg)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">"recv singal %d\n"</span>, arg);</span><br><span class="line">    <span class="built_in">exit</span>(EXIT_SUCCESS);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> sock;</span><br><span class="line">    <span class="keyword">if</span> ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"socket"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">sockaddr_in</span> <span class="title">serveraddr</span>;</span></span><br><span class="line">    <span class="built_in">memset</span>(&amp;serveraddr, <span class="number">0</span>, <span class="keyword">sizeof</span>(serveraddr));</span><br><span class="line">    serveraddr.sin_family = AF_INET;</span><br><span class="line">    serveraddr.sin_port = htons(<span class="number">5188</span>);</span><br><span class="line">    serveraddr.sin_addr.s_addr = inet_addr(<span class="string">"127.0.0.1"</span>);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (connect(sock, (struct sockaddr *)&amp;serveraddr, <span class="keyword">sizeof</span>(serveraddr)) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"connect"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">pid_t</span> pid;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> ((pid = fork()) &lt; <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        ERR_EXIT(<span class="string">"fork"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">else</span> <span class="keyword">if</span> (pid == <span class="number">0</span>)</span><br><span class="line">    &#123; <span class="comment">// 子进程</span></span><br><span class="line">        signal(SIGUSR1, handler);</span><br><span class="line">        <span class="keyword">char</span> sendbuf[<span class="number">1024</span>] = &#123;<span class="number">0</span>&#125;;</span><br><span class="line">        <span class="keyword">while</span> (fgets(sendbuf, <span class="keyword">sizeof</span>(sendbuf), <span class="built_in">stdin</span>) != <span class="number">0</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">if</span> (write(sock, sendbuf, <span class="keyword">sizeof</span>(sendbuf)) &lt; <span class="number">0</span>)</span><br><span class="line">            &#123;</span><br><span class="line">                ERR_EXIT(<span class="string">"write"</span>);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="built_in">memset</span>(sendbuf, <span class="number">0</span>, <span class="keyword">sizeof</span>(sendbuf));</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">"child close\n"</span>);</span><br><span class="line">        close(sock);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">else</span></span><br><span class="line">    &#123; <span class="comment">// 父进程</span></span><br><span class="line">        <span class="keyword">char</span> recvbuf[<span class="number">1024</span>] = &#123;<span class="number">0</span>&#125;;</span><br><span class="line">        <span class="keyword">while</span> (<span class="number">1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">int</span> ret;</span><br><span class="line">            <span class="keyword">if</span> ((ret = read(sock, recvbuf, <span class="keyword">sizeof</span>(recvbuf))) &lt; <span class="number">0</span>)</span><br><span class="line">            &#123;</span><br><span class="line">                ERR_EXIT(<span class="string">"read"</span>);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">else</span> <span class="keyword">if</span> (ret == <span class="number">0</span>)</span><br><span class="line">            &#123;</span><br><span class="line">                <span class="built_in">printf</span>(<span class="string">"server close\n"</span>);</span><br><span class="line">                <span class="keyword">break</span>;</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="built_in">fputs</span>(recvbuf, <span class="built_in">stdout</span>);</span><br><span class="line"></span><br><span class="line">            <span class="built_in">memset</span>(recvbuf, <span class="number">0</span>, <span class="keyword">sizeof</span>(recvbuf));</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">"parent close\n"</span>);</span><br><span class="line">        kill(pid, SIGUSR1);</span><br><span class="line">        close(sock);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

      
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